ESA UNCLASSIFIED - For Official Use

Introduction to Galileo PRS

Fabio Covello

20/09/2017

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 2

Galileo mission figures

• The Galileo Space Segment:

• 30 satellites (full constellation) Walker 24/3/1 constellation + 6 spares

• Altitude of 23222 km (MEO)

• 3 orbital planes, inclination of 56°

• 14 hours to orbit the Earth

• Payload: Highly stable atomic clocks

• The Galileo Ground Segment :

• two Ground Control Centers (GCC),

• five Telemetry, Tracking and Control (TT&C) stations,

• nine Mission Uplink Stations (ULS),

• a global network of 16 Galileo Sensor Stations (GSS)

• the European GNSS Service Centre (GSC).

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 3

Constellation Satellites

Mass at Launch Power Consumption Dimensions

Orbit Injection

Attitude Profile

700kg 1420W 2.7 x 1.6 x 14.5 m Direct into MEO orbit Yaw Steered

S/C Prime Contractor Astrium GmbH

(now Airbus Defence & Space)

4 satellites – 4 In-Orbit

Mass at Launch Power Consumption Dimensions

Orbit Injection

Attitude Profile

733kg 1900 W 2.5 x 1.1 x 14.7 m Direct into MEO orbit Yaw Steered

S/C Prime Contractor OHB Systems GmbH

P/L Prime Contractor SSTL Ltd

22 satellites – 14 In-Orbit

IOV

FOC

3

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 4

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 5

Galileo Services

Services to be provided by Galileo:

• Open Service (OS)

• Commercial Service (CS)

• Public Regulated Service (PRS)

• Search And Rescue Service (SAR)

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 6

What is PRS

Galileo Service Restricted to government-authorised users, intended for security

and strategic infrastructure. It provides the outstanding Positioning, Velocity and

Timing (PVT) performance of Galileo with:

• High level of service continuity

• Higher level of protection (confidentiality)

• Robustness against unintended and intended interferences

Frequency Band E1 E6

Centre Frequency 1575.42 1278.75

Access Technique CDMA CDMA

Spreading Modulation BOCcos(15,2.5) BOCcos(10,5)

Subcarrier frequency 15.345 MHz 10.23 MHz

Code Frequency 2.5575 MHz 5.115 MHz

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 7

How to get these characteristics

Service continuity is granted at system level via the adoption

of engineering measures to minimize the probability of service

interruption

Confidentiality is implemented via the adoption of encryption

schemas allowing only the authorized user to access the

service.

Robustness against interference is implemented via the

selection of appropriate Signal characteristics and technical

measures limiting the overlapping of the Spectrum with other

signals and the possibility to counterfeit the signal.

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 8

Legal framework

The Rules for access to the public regulated service provided by the global

navigation satellite system established under the Galileo program are defined in:

DECISION N. 1104/2011/EU

OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL 25 October 2011

Competent PRS Authority

Galileo Security Monitoring Centre

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 9

Development

GIOVE A & B

In-Orbit Validation

FOC2

Full Services

FOC1

Initial Services

2011-2013

2014-2016

2020

Deployment / Exploitation Plan

Exploitation Phase

2017-2019

2005 & 2008

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 10

2 4 6 8 10 12 14 18 22 26 Number of satellites launched

L#1 L#2 L#3 L#4 L#5 L#6 L#7

L#8 L#10 L#9

IOV FOC 2011 2012 2013 2014 2015 2016 2017 2018

Launch Plan

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 12

High Signal Availability

Availabilities reported since first complete month in operation.

Availability reduced by

• On Board S/W upgrades

• On Board Clocks maintenance

• Station keeping manoeuvre

High Signal Availability

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 13

L8: 4/4/7

L8+L3: 4/4+2/7

L9+L3: 8/4+2/7 Central European User (@ 5deg masking)

Launch Constellation

configuration

Availability of

PDOP < 5

PVT Opportunities over 10 days/

average duration

L8 4/4/7 79.6% 74 / 2.58 hrs

L8 + L3 4/4/7+2 86.0% 62 / 3.33 hrs

L9 8/4/7+2 99.8% 4 / 59.89 hrs

(~8 min average time with insufficient geometry)

Increased Availability of Positioning

L8: 4/4/7 L8+L3: 4/4+2/7 L9+L3: 8/4+2/7 L10+L3: 8/8+2/7

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 14

As-observed Ranging Performance - OS

Decreasing Ranging Error trend due to increasing number of satellites and improvements in the Ground Segment

Ranging accuracy Constellation Average ~0.20m and 0.24m Worst Healthy Satellite

14

NAGU 2017015/16

SISE (14 hrs moving average) for all Healthy Satellites

NAGU 2017019

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 15

Positioning Performance & Availability - OS

4 more satellites operational: in May/June 2017

Satellites in operational constellation 11 13 15

Availability of H Accuracy <10 m 89% 96% 98%

Global PDOP <=6 availability 41% 60% 78% w/o L8 satellites: 3.46m (95%)

with L8 satellites 2.53m (95%)

Horizontal accuracy of global stations on a sample day:

FNAV (incl. all L#8 satellites)

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 16

UTC Dissemination - OS

Overall good performance of 9.3 ns (95%)

Initial Services target: 30 ns (95%)

16

Timing HW failure

System re-calibration

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 17

SISRE Overview (April 2017) – (source DLR*)

Independent measurement campaign

(*) ref: Multi-GNSS SISRE Monitoring – Methodology and Results - P. Steigenbergen, O. Montenbruck (GSOC) http://www.igs.org/assets/pdf/W2017-PY01-02%20-%20Steigenberger.pdf

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 18

GSA for PRS Preparation:

GSA supports Member States and EC agencies in the preparation

and development of their PRS receivers.

Also GSA support MS CPA using the

service (providing training and grants

like JTA giving MS opportunity to

exploit the service).

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 19

ESA PRS Receiver compatibility test program

Testing PRS receivers with the Galileo

navigation system

• Foster the use of Galileo PRS

• Support MS and manufacturers

Early product testing

• Get the best products for Galileo

• Receive early real world feedback

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 20

What and how we test

• Security Module

•PRS user test bench

•Interfaces

•Security Implementation

•Key Management

•User access control

• Receiver performances

•Real signal

•Rooftop antennas

•Mobile test vehicle, blue van ->

•Simulated signal

•Radio Frequency Constellation

Simulator

ESA UNCLASSIFIED - For Official Use Fabio Covello | 20/09/2017 | Slide 21

OS 2017 ACHIEVEMENT = PRS 2020 AIM

ESA UNCLASSIFIED - For Official Use

Thank you

Fabio Covello

20/09/2017